package com.turing.draw.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

@Configuration
public class TaskExecutorConfig implements AsyncConfigurer {

   @Bean("ocrMergeTaskExecutor")
   public Executor ocrMergeTaskExecutor(){

      return initExecutor();

   }

   @Bean("postProcessorTaskExecutor")
   public Executor scriptsTaskExecutor(){

      return initExecutor();

   }

   private Executor initExecutor() {

      ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();

      //核心线程数10：线程池创建时候初始化的线程数
      executor.setCorePoolSize(5);

      //最大线程数20：线程池最大的线程数，只有在缓冲队列满了之后才会申请超过核心线程数的线程
      executor.setMaxPoolSize(20);

      //缓冲队列200：用来缓冲执行任务的队列
      executor.setQueueCapacity(200);

      //允许线程的空闲时间60秒：当超过了核心线程出之外的线程在空闲时间到达之后会被销毁
      executor.setKeepAliveSeconds(60);

      //线程池对拒绝任务的处理策略：这里采用了CallerRunsPolicy策略，
      // 当线程池没有处理能力的时候，该策略会直接在 execute 方法的调用线程中运行被拒绝的任务；
      // 如果执行程序已关闭，则会丢弃该任务
      executor.setThreadNamePrefix("ocrMergeTaskExecutor-");
      executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
      return executor;

   }

}